This book constitutes the refereed proceedings of the First International Workshop on Numerical Analysis and Its Applications WNAA 96 held in Rousse Bulgaria in June 1996 The 57 revised full papers presented were carefully selected and reviewed for inclusion in the volume also included are 14 invited presentations All in all the book offers a wealth of new results and methods of numerical analysis applicable in computational science particularly in computational physics and chemistry The volume reflects that the cooperation of computer scientists mathematicians and scientists provides new numerical tools for computational scientists and at the same time stimulates numerical analysis This text comprises the proceedings of the First International Workshop on Numerical Analysis and Its Applications WNAA 96 held in Rousse Bulgaria in June 1996 The 57 revised papers presented were carefully selected and reviewed for inclusion in the volume also included are 14 invited presentations It presents recent results and methods of numerical analysis applicable in computational science particularly in computational physics and chemistry